Report Says FSA Slow on Libor

LONDON—The U.K. Financial Services Authority on Tuesday published a critique of its own handling of the Libor scandal, saying it failed to act on a series of warnings that banks were trying to manipulate rates.

The internal report, commissioned in the wake of Barclays PLC's £290 million ($438.3 million) settlement for attempted rate rigging, shows the British regulator repeatedly failed to heed warning signs that rates were being...